node/tools/wafadmin/Environment.py at https · reado/node · GitHub

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#!/usr/bin/env python

# encoding: utf-8

# Thomas Nagy, 2005 (ita)

"""Environment representation

There is one gotcha: getitem returns [] if the contents evals to False

This means env['foo'] = {}; print env['foo'] will print [] not {}

"""

import os, copy, re

import Logs, Options, Utils

from Constants import *

re_imp = re.compile('^(#)*?([^#=]*?)\ =\ (.*?)$', re.M)

class Environment(object):

"""A safe-to-use dictionary, but do not attach functions to it please (break cPickle)

An environment instance can be stored into a file and loaded easily

"""

__slots__ = ("table", "parent")

def __init__(self, filename=None):

self.table = {}

#self.parent = None

if filename:

self.load(filename)

def __contains__(self, key):

if key in self.table: return True

try: return self.parent.__contains__(key)

except AttributeError: return False # parent may not exist

def __str__(self):

keys = set()

cur = self

while cur:

keys.update(cur.table.keys())

cur = getattr(cur, 'parent', None)

keys = list(keys)

keys.sort()

return "\n".join(["%r %r" % (x, self.__getitem__(x)) for x in keys])

def __getitem__(self, key):

try:

while 1:

x = self.table.get(key, None)

if not x is None:

return x

self = self.parent

except AttributeError:

return []

def __setitem__(self, key, value):

self.table[key] = value

def __delitem__(self, key):

del self.table[key]

def pop(self, key, *args):

if len(args):

return self.table.pop(key, *args)

return self.table.pop(key)

def set_variant(self, name):

self.table[VARIANT] = name

def variant(self):

try:

while 1:

x = self.table.get(VARIANT, None)

if not x is None:

return x

self = self.parent

except AttributeError:

return DEFAULT

def copy(self):

# TODO waf 1.6 rename this method derive, #368

newenv = Environment()

newenv.parent = self

return newenv

def detach(self):

"""TODO try it

modifying the original env will not change the copy"""

tbl = self.get_merged_dict()

try:

delattr(self, 'parent')

except AttributeError:

pass

else:

keys = tbl.keys()

for x in keys:

tbl[x] = copy.deepcopy(tbl[x])

self.table = tbl

def get_flat(self, key):

s = self[key]

if isinstance(s, str): return s

return ' '.join(s)

def _get_list_value_for_modification(self, key):

"""Gets a value that must be a list for further modification. The

list may be modified inplace and there is no need to

"self.table[var] = value" afterwards.

"""

try:

value = self.table[key]

except KeyError:

try: value = self.parent[key]

except AttributeError: value = []

if isinstance(value, list):

value = value[:]

else:

value = [value]

else:

if not isinstance(value, list):

value = [value]

self.table[key] = value

return value

def append_value(self, var, value):

current_value = self._get_list_value_for_modification(var)

if isinstance(value, list):

current_value.extend(value)

else:

current_value.append(value)

def prepend_value(self, var, value):

current_value = self._get_list_value_for_modification(var)

if isinstance(value, list):

current_value = value + current_value

# a new list: update the dictionary entry

self.table[var] = current_value

else:

current_value.insert(0, value)

# prepend unique would be ambiguous

def append_unique(self, var, value):

current_value = self._get_list_value_for_modification(var)

if isinstance(value, list):

for value_item in value:

if value_item not in current_value:

current_value.append(value_item)

else:

if value not in current_value:

current_value.append(value)

def get_merged_dict(self):

"""compute a merged table"""

table_list = []

env = self

while 1:

table_list.insert(0, env.table)

try: env = env.parent

except AttributeError: break

merged_table = {}

for table in table_list:

merged_table.update(table)

return merged_table

def store(self, filename):

"Write the variables into a file"

file = open(filename, 'w')

merged_table = self.get_merged_dict()

keys = list(merged_table.keys())

keys.sort()

for k in keys: file.write('%s = %r\n' % (k, merged_table[k]))

file.close()

def load(self, filename):

"Retrieve the variables from a file"

tbl = self.table

code = Utils.readf(filename)

for m in re_imp.finditer(code):

g = m.group

tbl[g(2)] = eval(g(3))

Logs.debug('env: %s', self.table)

def get_destdir(self):

"return the destdir, useful for installing"

if self.__getitem__('NOINSTALL'): return ''

return Options.options.destdir

def update(self, d):

for k, v in d.iteritems():

self[k] = v

def __getattr__(self, name):

if name in self.__slots__:

return object.__getattr__(self, name)

else:

return self[name]

def __setattr__(self, name, value):

if name in self.__slots__:

object.__setattr__(self, name, value)

else:

self[name] = value

def __delattr__(self, name):

if name in self.__slots__:

object.__delattr__(self, name)

else:

del self[name]

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